It looks like some tents don't open flat. Some have a slight "V" to them. The ARB's (Romers and Martins pics) look totally flat when open. The Tepui's look "V" shaped in their pics??

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They don't open completely flat when there is no one inside. There are straps that cross over the internal frame that help support it and it seems like there is some tension there that keeps them from opening flat when empty. When you're inside, it seems to flatten out. I've never noticed it feeling like it was V shaped when inside, but it is noticeable from outside.